Bub perspires a lot, even when aircon is on, but say at 24-25 degrees. How can I better train her not to perspire so much?

Is your baby swaddled or wearing a footed sleepsuit? If so, you may considering adjusting the temperature down to 18-20degrees. I've read that it is more important to check that your baby is not too cold or too hot. A simple way (as highlighted in this article: http://sg.theasianparent.com/the-ideal-temperature-for-your-babys-room/) would be to place your hand on the base of his/her neck where it meets his/her spine. If you baby is either too hot or too cold, you will feel it there. Hope this helps!